Presented to: SBAS Technical Interoperability Working Group Date: 21 June 2005 Federal Aviation Administration Certification of the Wide Area Augmentation System (WAAS) Dan Hanlon WAAS Program Manager

Federal Aviation Administration 2 Certification of the Wide Area Augmentation System (WAAS) 21 June 2005 A New Paradigm WAAS was the first navigation aid to be certified nationally As such, many of FAA’s standard certification criteria had to be tailored to fit the program

Federal Aviation Administration 3 Certification of the Wide Area Augmentation System (WAAS) 21 June 2005 Steps to Certification FAA Administrator Directs Establishment of an Independent Review Board (IRB) –Role: Perform an Independent Assessment of the Need for a Satellite Based Augmentation System and to Independently Review the Technical Solution Proposed by the WIPP –Reported Findings to the Administrator WAAS Program Office Establishes a WAAS Integrity Performance Panel (WIPP) –Role is to Establish Technical Approach and Solution for Meeting Integrity

Federal Aviation Administration 4 Certification of the Wide Area Augmentation System (WAAS) 21 June 2005 Steps to Certification WIPP Comprised of WAAS Experts……(FAA, Academia, Industry) WIPP Meetings with Contractor Held Monthly to Review and Evaluate Contractor’s Progress FAA Briefed Status of WIPP Activities to IRB who then Reported Back to Administrator

Federal Aviation Administration 5 Certification of the Wide Area Augmentation System (WAAS) 21 June 2005 Role of the WAAS Integrity Performance Panel (WIPP) Provided The Needed Expertise To Help Define The Actual Threats Or Threat Models That WAAS Would Have To Be Designed To Protect Against WIPP Was Charged With Defining The Extent Of The Threats Including Their Description And Likelihood WIPP Judged The Completeness Of A Monitor’s Design WIPP Insured That The Threat Models Generated Fully Spanned All Feared Events

Federal Aviation Administration 6 Certification of the Wide Area Augmentation System (WAAS) 21 June 2005 FAA Certification

Federal Aviation Administration 7 Certification of the Wide Area Augmentation System (WAAS) 21 June 2005 Certification by Program Phase System Development –System Owned by Contractor Contractor Must Prove System Meets Safety Certification Criteria Prior to FAA Acceptance Contractor Acceptance Inspection (CAI) –Program Office Formally Accepts Ownership of System Operational and Security Certification Period Begins Joint Acceptance Inspection (JAI) –Field Satisfied That System is Functioning and All Support Material Is in Place Commissioning –Requires JRC In Service Decision –System Becomes Part of National Airspace System

Federal Aviation Administration 8 Certification of the Wide Area Augmentation System (WAAS) 21 June 2005 Types of Certification Safety Certification –Performed By the Product Team Prior to Acceptance From the Contractor –Design Assurance Process Used to Provide Sufficient Proof That The Integrity Requirements Are Achieved Operational Certification –Performed by Airways Facilities Validation that WAAS is Working Properly Within the NAS Infrastructure Equipment is Functioning Within Limits Operators and Maintainers Are Trained Procedures Are in Place and Being Followed Security Certification –Compliance With Security Requirements, Procedures & Training

Federal Aviation Administration 9 Certification of the Wide Area Augmentation System (WAAS) 21 June 2005 WAAS Integrity Issue WAAS Integrity Design Did Not Provide Proof of Compliance For Integrity Requirement –Traditional Testing Methods Showed That the Design “Did Not Fail” Complete Definition of the Potential Threat Models Was Not Performed –Standards In Place At That Time Did Not Require This Level of Assurance Integrity Monitoring Algorithms Were Not Designed To Support This Type Of Analysis In Response –WAAS Program Office Formed WAAS Integrity Performance Panel (WIPP) –FAA Administrator Requested Independent Review Board (IRB) WIPP Activities Were Integrated With System Engineering and Development Activities

Federal Aviation Administration 10 Certification of the Wide Area Augmentation System (WAAS) 21 June 2005 Summary Complex Architecture Requires Detailed Process and Documentation for Capturing and Assuring WAAS Safety FAA efforts to involve many stakeholders was crucial in resolving the integrity risk Future Changes to WAAS must undergo the same safety assessment activities to ensure continued system safety